Medically reviewed by Edmund Khoo, DDS Key Takeaways Dental X-rays help find cavities and check bone levels. Periapical X-rays show the complete tooth from crown to root. Digital X-rays use less ...

Astronomers had already classified some celestial objects that emitted low-energy X-rays as “supersoft.” The new objects emit just the lowest-energy slice of supersoft X-rays, so the researchers call ...